/*
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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/*
 *
 *
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 *
 *
 * Copyright (c) 2004 World Wide Web Consortium,
 *
 * (Massachusetts Institute of Technology, European Research Consortium for
 * Informatics and Mathematics, Keio University). All Rights Reserved. This
 * work is distributed under the W3C(r) Software License [1] in the hope that
 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 */

package org.w3c.dom;

/**
 * When associating an object to a key on a node using <code>Node.setUserData()</code> the
 * application can provide a handler that gets called when the node the object is associated to is
 * being cloned, imported, or renamed. This can be used by the application to implement various
 * behaviors regarding the data it associates to the DOM nodes. This interface defines that handler.
 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object
 * Model (DOM) Level 3 Core Specification</a>.
 *
 * @since DOM Level 3
 */
public interface UserDataHandler {
  // OperationType
  /**
   * The node is cloned, using <code>Node.cloneNode()</code>.
   */
  public static final short NODE_CLONED = 1;
  /**
   * The node is imported, using <code>Document.importNode()</code>.
   */
  public static final short NODE_IMPORTED = 2;
  /**
   * The node is deleted.
   * <p ><b>Note:</b> This may not be supported or may not be reliable in
   * certain environments, such as Java, where the implementation has no
   * real control over when objects are actually deleted.
   */
  public static final short NODE_DELETED = 3;
  /**
   * The node is renamed, using <code>Document.renameNode()</code>.
   */
  public static final short NODE_RENAMED = 4;
  /**
   * The node is adopted, using <code>Document.adoptNode()</code>.
   */
  public static final short NODE_ADOPTED = 5;

  /**
   * This method is called whenever the node for which this handler is
   * registered is imported or cloned.
   * <br> DOM applications must not raise exceptions in a
   * <code>UserDataHandler</code>. The effect of throwing exceptions from
   * the handler is DOM implementation dependent.
   *
   * @param operation Specifies the type of operation that is being performed on the node.
   * @param key Specifies the key for which this handler is being called.
   * @param data Specifies the data for which this handler is being called.
   * @param src Specifies the node being cloned, adopted, imported, or renamed. This is
   * <code>null</code> when the node is being deleted.
   * @param dst Specifies the node newly created if any, or <code>null</code>.
   */
  public void handle(short operation,
      String key,
      Object data,
      Node src,
      Node dst);

}
